Core molding apparatus



April 9, 19.40.

J. F. MAINE CURE MOLDING APPARATUS 5 Sheets-Sheet 1 Filed June 1, 1938 E; U l

We/f ATTORNEY.

Aprl`9, 1940. J. F. MAINE 2,196,835

coRE MOLDING APPARATUS 3 Sheets-Sheet 2 INVENTOR.

James /L/Va/be ATTORNEY.

April 9, 1940. J. F. MAINE CORE MOLDINGAPPARATUS 3. Sheets-Sheet 3 .Filed Jugo 1. 1958 y A INVENTOR. James ffm/7a Patented Apr. 9. 1949 UNITED STATES PATENT OFFICE Consolidated Iron-Steel Mfg. Co., Ohio, a corporation of Ohio Cleveland,

Application June 1, 1938, Seria-l No. 211,168

` s olaims. (o1. 224-10) VThis invention relates .Y to molding apparatus and particularly to apparatus for making mold cores. I

C'ore making apparatus is well known in which, after a pairof mating core molds on the apparatus are filled with core material, parts of the apparatus may be hingingly moved; to form gas vent passages in the molded core parts; and

to superimpose one of two parts of the core upon the other to make a complete core; andv to draw the molds from the core thus formed; and to deposit the formed core upon adryer device which conforms to the shape of the core to support it While being baked.

In all such apparatus, it is necessary for the hingingly moving parts of the apparatus to register exactly with each other when hingingly moved from one position to another in the operation of the apparatus, in order to accurately register the superimposed parts ofthecore with each other, and to register the dryer device with the formed core, etc. In prior core apparatus of this class, these registering relations can 'be obtained only with .great diiculty because of defectsin the form and arrangement of the parts, and in any case, is soon lost after a relatively short period of use of the apparatus because of the rapidv abrasion and wear of the relatively moving parts by the action of the abrasive core making material which unavoidably nds its way into ythe bearings of the moving parts.

It is one of the objects 'of this invention to provide an improved apparatus of the class deu scribed having bearings for the hingingly movable parts, constructed in an improved manner to resist or prevent such abrasive wear.

Another Objectis to provide an improved unitary mold support or frame which may be permanently assembled with a mold and constructed to be interchangeable with other like molds and supports, and, at the time of use, being detachably mountable o-n the main frame of the apparatus for hinging vmovement thereon in the operation of the apparatus'for the purposes described above.

Another object is to provide an improved hingingly movable core mold support, vent mold support, and dryer `device support, for an apparatus of the class described.

Another object is to provide an improved .spring balanced mounting for a hingingly movaof the class referred to, an improved construction of hingingly movable core mold support and an improved hinging bearing therefor.

Another object is to provide generally an improved co-re molding apparatus of the class. re- 5 ferred tol Other objects will be apparent to those skilled in the art to which my invention appertains.

My invention is fully disclosed in the following .description taken in connection with the accom-- panying drawings in which:

Fig.' l is a front elevational View of an apparatus embodying my invention;

Fig. 2 isa top plan View of the apparatus of Fig. l; l5

Fig. 3 is avieW in some respects diagrammatic and Villustrating different positions into which lhingingly movable parts of the apparatus of Figs.

1 and2 may be moved in the operation of the apparatus;

Fig. .Ll is a sectional view taken from the plane 4 of'Fig. 1

Fig. 5 is a sectional 5 of Fig. l; y

Fig. Gis a View similar to Fig. 5 but illustrating 25 partsthereof in different operative positions;

Fig. '7.is a View similar to part of Fig. 2, but drawn to larger scale, and with` partsr :broken away and other parts in section for clearness;`

Fig. S-is va fragmentary sectional view taken from the plane 8 of Fig. 7;

Fig. 9 is a sectional View taken from the plane 9 of Fig'. 7; l

Figs. 10 and 11 are fragmentary viewssimilar respectively to Figs. 7 and 9, but illustrating a modication;

Figs. 12, 13 and Mare other views similar toa part of Figs. 7 and 9, respectively, but illustrating l another modification;

Fig. 15 is a side elevational view, partly vin section of a core which may be made in an illustrative operation of the apparatus of the preceding figures;

Fig. 16 is a sectional View taken view taken from the plane from the plane `iii of Fig. 15; and 45 part of Fig. 4l,

supported upon legs 6 6 in the corners of the frame, which may, as shown in Fig. 4, be made from tubing or pipe and welded into the corners of the base.

Secured to the back bar 3 is a pair of hinge brackets 1 1 and spaced therefrom a second pair of hinge brackets 8 8, these ybrackets being preferably formed from steel angle section, one flange of each angle being secured to the back bar 3, for example by welding, and the other flanges of the angles being slightly spaced apart and in generally parallel relation.

A frame shown generally at 9, and which, as will presently be described, is arranged to support a core vent mold, has a pair of flat bar-like llegs I0 and II thereon., which are disposed respectively between said pairs of parallel bracket anges, and hinged thereto by bolts I2 and I3 projecting through perforations in the anges and in the legs. In the preferred construction, as best shown in Figs. 4 and 5, the bracket flanges are provided with a plurality, such as four, perforations I 4 I4 of a size toapproximately t the bodies of the bolts I2 and I3; and the legs I6 and II, as shown for the leg I0, in Fig. 4, `are provided with a larger perforation i5 into which is press-fitted a bushing I6. By this means, a rotary or hinging movement is provided for the frame 9 and the relative movement occurs between the bushing and the bolt. By removing the bolt and replacing it in one or another of the four perforations I4 i4, the position ofthe frame 9 relative to the other parts of the device may be changed, for a purpose to be described.

The legs lil and I I have downwardly projecting fingers I 1 formed thereon, which, when the frame 9 is in its upper or normal position, illustrated in Figs. l, 2, 4 and 5, engage the back bar 3 of the base, and function as stops to position the frame.

The frame 9 is rectangular in form, as shown in Fig. 1, and is preferably built up from pieces of angle section steel welded together (although to simplify the drawing it is shown as made of solid section bars), and has cross bars I8-I8 within the rectangle, providing an open work frame upon which core vent molds, shown at I9 l9, may be secured in any suitable manner, for example by bolts or screws, not shown, projected through perforations in the frame.

The legsIll and II are preferably secured to the lower edge of the frame 9 by welding, and the frame is provided with a handle 2l by which it may be hingingly moved in the operation of the apparatus.

A pair of lugs 2222, Figs. 1 and 5, are secured, for example by welding, to the lower edge of the frame 9, preferably between the legs Ill and II and slightly spaced apart, and a link 23 is disposed therebetween and pivotally connected thereto by a bolt or pin 24. The lower end of the link 23 is provided with a perforation 25 into which is hooked the upper end of a tension spring 26, the lower .end of which is hooked into the eye of an eye-bolt 21 projected through a perforation in a bracket 28, and adjustably positioned .therein to adjust the tension of the spring by nuts 26-29 on the bolt and on opposite sides of the bracket, the body of the bracket extending upwardly and being secured, for example by welding, to the back bar 3 of the base. The spring 26 normally holds the frame 3 in, or returns it to its upper or normal position.

In the operation of the device, to be described, when the frame 9 is hingingly lowered by means of the handle 2 I, the parts take up the positions shown in Fig. 6, in which as shown, the spring 26 is stretched. The center line of the spring action, between the pin 24 and the eye of the bolt 21 is, as shown in Figs. 5 and 6, always outward of the axis of the hinge bolts I2 and I3, but as the frame 9 is rocked downwardly, this line of action moves toward the axis, as shown in going from the position of Fig. 5 to that of Fig. 6, so that the frame-returning-force of the spring is maximum when the frame 9 is in its upper normal position.

In some uses of the apparatus, it may be desired to shift the position of the frame 9 on the main base, and to this end, hinge brackets SEI-3U are provided for use with the brackets 8 8 instead of the brackets 1 1, and a bracket 3I is provided for the spring mounting corresponding to the bracket 28.

Upon the front bar 2 is secured, for example by welding, a fiat bar post 32, opposite the bracket 28, and a similar post 33, opposite the bracket 3I; and by a construction to be described, a frame 34 is hinged on an axis 15 to the upper ends of the bracket and post 28 32, and a frame 35 is hinged on an axis 16 to the upper ends of the bracket and post 3 I 33, and a third frame 36 is arranged to hinge on both the axes 15 and 16. The frames 34 and 35 may be generally similar and comprise front bars 31, back bars 38 and side bars 39 and 48, and the frame 36 likewise comprises front and back bars 4I and 42 and side bars 43 and 44. Within each frame an open frame work is provided by transverse bars 45, or the like, having perforations, not shown, therein through which bolts or screws may be projected to secure upon the frames 34 and 36 core molds, shown at 41 and 48 respectively, and to secure on the frame 35 a core supporting or dryer device, shown at 49.

The frames 34, 35 and 36 may be constructed from angle sections, .although they are illustrated for simplicity in drawing, as constructed of solid bars.

The frames 34 and 35 have rearward extensions 58 and 5I, and the middle frame 36 has rearward extensions 52 and 53.

An illustrative operation of the apparatus thus far described will now be given for making an illustrative core, such as is shown in Figs. 15, 16 and 17, which` core comprises upper and lower halves 54 and 55 and a cross-form gas vent duct an adhesive binder, and strikes off the surplus` material flush with the upper surface of the core molds, leaving in each core mold one half of the core with a plane face thereon. The frame 8 is then lowered and the vent pattern 58 is pressed into the faces of the core halves and then the vent mold is withdrawn. Adhesive material is then applied on one or both of the plane faces for gluing them together, or this may be omitted when suitable core mixtures are used.

By means of a handle 59l on the frame 34 and a rod-like handle 68 on the frame 36, these two frames are then lifted and rocked around the axis 15 of the hinge connection for these frames referred to above, the frames moving into the positions shown therefor in Fig. 3.

poses the two faces of the core upon each other, and, with the faces in engagement, the two frames are rocked together until the frame 36 isin its original position, and then the frame 34 is rocked back to its original position, withdrawing its core mold 41 from the core and leaving the completed and vented core resting on the core mold 48. on the frame 36.

The dryer device 49 on the frame 35 is preferably made from cast iron and has therein a cavity corresponding generallyv to the shape of the lower half of the `core which is nowuppermost on the frame 36, and the frames 3E and 35 are now rocked on the axis 15, Aby means of a barlike handle 6I on the frame 36 and a loop handle E2 on the frame 3,5, into theposition shown for these frames in Fig. 3,V whereby the cavity in the dryer device is iitted over the lower `half of the core supported in the core mold 48, and then the two frames are rocked together untilthe frame 35 is back in its original position, and the frame 36 is rocked back to its original position withdrawing the upper core mold 48 from the core, leaving the core supported upon the dryer device. As `an alternative mode of operation, with the completed core resting on the frame 3,6, the dryer device is placed upon the lower half of the core on the frame 36, and then the frame 35 isv rocked over until the frame rests upon the dryer device. Then the two frames 3S and 35 are rocked over together until the frame 35 is in its normal position on the base, and then the frame 36 is rocked back to its original position on the base, withdrawing the core mold 48 from the core, leaving the core supported on the dryer device 49, which is in turn supported o n the frame 35.r

In the first mode of operation of the dryer device, it must be detachably secured to the frame 35, but in the latter mode of operation it may simply rest loosely thereon.v mode of operation, the dryer device 34 with the core supported thereon, is then removed to the oven in which the core is baked, to dry and finally linish it.

The construction of the hinging connections on which the frames may be moved as described above, constitutes one of the essential parts of the present invention and will now be described in detaiLsee Figs. v7, 8 and 9.

The side bar 4U of the lframe 35has .detachably bolted thereto a U-shaped member 63 by bolts 64-54 permanently secured to the bar 63 and extending through-bores in the bar 40Aand having nuts 65 thereon.y The member 63 has substan tially parallel arms (S6-66 extending upwardly at an angle to the bar 4U and in their upper ends are provided with large openings B'l-'l in which are axially aligned outer raceways 6868 of ball bearings.

Socket devices 69-69 comprising each a body portion 'IU and a shank 1I of reduced diameter axis 'I5 determined by the axis of the ball bearing.

A similar construction is provided for hingingly mounting the frame 34 to rock around the said axis 'I5 on the post 32 and the bracket 23.

The frame 36, on the right hand side thereof` In either as viewed in Figs. 2 and 7, has a U -shaped member 'H detachably bolted thereto bybolts 'IB-18 preferably permanently secured to the member 'l1 and projected through bores 'H9-'19 in the sidebar 44 and in the extension 53 thereof, and.;v

secured by nuts Bil-8D; and arms 3l- 8| of the member 1'! extend upwardly atan angle from the side bar 44 of the frame 36 and at their outer ends have axially alignedbores 8,2-82

therein through which extends the'said rod 63,; l.1() the rod being secured yin the arm ends by setV scr ews'8 3'-83.` The opposite ends of thev rod Si! extend beyond the armsBI-Bl, `providing trunnions 84-34, which rest in upwardly open re` cesses 8f3-85 formed in the upper sides of the.y

body portions 'lil-'l5 of the socket devices 69u59.y

Thevbottoms ofy ythese recesses are circular and `rco-axial with the axis 'I6 above referred to, and the trunnions 84 are circular in section and t accurately in the bottoms of these recesses.

'I'he devices 59, and particularly the body perf tions V'Ill thereof, are preferably made from hardened steel as are the trunnions 34 to resist or prevent vwear thereof. The bottoms 'of the recesses 85 open downwardly through bores or. perforations 85 whereby dirt or other .foreign material which may lodge in the recessesA may fall or` work downwardly out therefrom.

It will be observed that the Asocket devices 39 f l fIfhe arms SI-l at their outer ends are en-s,A

gaged between the inner ends of the socket devices and axial lost motion is thereby prevented.

By constructing the hinge bearings, as vabove described, lost motion inthe hinge bearings'is completely avoided; and the molds, when once,

they have been accurately positioned on theirm' frame, will register accurately with each other l and with the'core; and this accuracy of registra-l tion will be retained even after a long period of use because of the wear resisting nature of tha bearings described.

If, in the operation of the apparatus as above described, the core-making sand or abrasive material should fall into the recess 85, it will readily work out therefrom through the perforations 86%.-,

and the rotational planes of the ball` bearings be?" material will lodge therein; butto insure cornpletely against the admission of abrasive material to eitherball bearing, the ball bearing may be sealedv by sealing rings 81 and 88, enclosing thel balls and races against all admission of abrasive material; and to protect the trunnions 84 and the recesses 85, shields or hoods 9l-9I may be provided, formed from sheet metal and welded tothe which, when the trunnions are in the recesses, completely coverboth. Abrasive core material is most :likely to fall in the recesses 85 when the trunnionsV 84 are therein, because it is at such times that the core material is being handled for themaking of the cores, and it is only at times when the core material is not being handled that the trunnions are out of the recesses and the re- Qesses uncovered by the removal of the needs M3175 ;.65 l arms l-8l and comprising hood portions 92--92 ire along with the trunnions 84 and arms 8 I, so that by the provision of the said hoods, entrance of abrasive material into the recesses issubstantially K prevented.

.opposite sides of the legs Iii-II respectively,

whereby dirt or abrasive material is prevented 'from entering.,T the bearing surfaces between the bushing and the bolt, and any wear which, in the course of time, may occur and cause looseness at these hinging joints can be readily eliminated by removing the bolts and bushings and replacing them with new ones. The bolts are prevented from turning by being drawn up tightly in clamping relation upon the brackets. The bushing I6 is of such length as to fit tightly at its ends between the brackets '1 -l.

Referring again to the vent mold frame 9, it will be understood that the vent molds I9 used on different production jobs may be of different weights. It is, at the same time, desirable that the operator who moves the frame shall have to exert a predetermined minimum of force and by utilizing the adjustable spring 26 this force may be made the same for the different molds.

When the rearmcst holes |4|4 are used for the hinge axis, it may have the eiect of causing the frame S toI incline rearwardly inits normal upper position, when the fingers I'I-I'I are engaged with the frame back-bar 3, and this may increase the distance which the operator must reach to take hold of the handle 2|. When it is desired to cause the frame 9 to be substantially vertical in its normal position for all the molds, this may be accomplished by providing an adjustable stop on the base back bar 3 for the finger II-I to engage. One form of such adjustable stop is shown in Fig. 18 wherein a screw 93 is threaded through the back bar 3 and fixed in any adjusted position by a nut 94, the outer end of the screw being disposed opposite the finger Il and engageable thereby.

In Figs. 10 and 11 I have illustrated a modication of the hinging bearing of Figs. 7 and 9 respectively. In thisform the arm 66 has, on the upper end thereof, an outwardly open recess 95 in which is seated the outer raceway S6 of a ball bearing. In this form the socket device 91 has a shoulder 98 by which the inner raceway 99 of the bearing is clamped upon the inner face of the bracket 3|, a portion |36 ofy reduced diameter on the socket device tting in and centering the inner raceway.

The recess 85 in the socket device 91 is covered by a hood 92 on the arm 8| asin the first described form. In this form, however, the bearing in the arm 66 is also covered by a hood construction comprising a hood mi, secured, for example by welding, on the upper end of the bracket 3i,

lextending round the curvature of the upper end thereof to points, as at |62 and |63 below the center of the bearing and extending axially inwardly to a point |04, beyond the ball bearing. The hood completely covers the bearing, and the overlapping relation of the hood permits the arm 66 to rock around the bearing under the hood in the operation of the device described above.

In a still further modification of this bearing construction shown in Figs. 12, 13 and 14, the arm 66 on the U-member 63 has in the end thereof a ball bearing which may be similar to that described in connection with the form of Fig. 7. A socket device |06 has a shank Il extending through the inner raceway |03 of the bearing and a shoulder |09 clamping the said inner raceway upon the bracket 3 I. A rod 60 secured by the screw 83 in the arm 8| has, outwardly of the arm instead of the solid trunnion of the other forms, a ball bearing thereon comprising an inner raceway I IU xed upon a reduced diameter end portion of the rod, and an outer raceway I I I, the periphery of which is providedv with an elevated bead H2. The body portion I|3 of the socket device has an upwardly open recess H4 therein the lower portion of which is circular and concentric with the rod 60 and the shank |01 and the upwardly open portion thereof flaring outwardly generally, as at I I6. The inner wall of the recess has formed therein a groove H5 substantially tting the said bead ||2.

In the operation of this form, when the rod or handle 60 is raised to rock the frame, the ball bearing on the rod 60 will be withdrawn out of the recess H4 in a manner similar to the withdrawal of the solid trunnion 84, above described for the other forms, and when the frame is rocked to return the rod 60, the ball bearing thereon will accurately seat in the socket device |06, the said groove I I5, in the outwardly flaring portions |I6 H6 thereof, guiding the outer raceway of the bearing to its seat in the recess. The outwardly flaring portions I6 of the groove, may have also,

as shown in Fig. 14, laterally aring side walls III-II'I to further guide or center the outer raceway into its seat in the socket device. The bottom of the recess ||4 may be provided with an opening H8, corresponding with the hole 86 in the bottom of the above described recess 85 to allow dirt or abrasive material which may fall thereinto to work out therefrom.

The raceways of the two ball bearings,v in the arm 66 and in the socket device |86 may be sealed by the construction of the bearings to prevent the entrance of foreign material to the race- Ways, but if preferred, both ball bearings may be covered by a hood according tothe construction described in connection with the form of Figs. 10 and 11.

My invention is not limited to the exact details of construction illustrated and described; changes and modifications may be made within the spirit of my invention without sacricing its advantages and within the scope of the appended claims.

I daim:

1. In a molding apparatus of the class described, a main frame, a mold carrying' frame having a hinging connection at Aeach of the opposite sides thereof with the main frame for alternate hinging movement relative to the main frame, said hinging connections comprising a pair'of forwardly and rearwardly spaced arms at each side of the mold carrying frame, a pair of bars each projected through aligned perforations in one of the pairs of arms and detachably secured thereto, the bars being parallel to each other and the opposite end portions of each projecting forwardly and rearwardly beyond the arms and being provided with axially aligned cylindrical bearing trunnions, a pair of trunnion socket members corresponding to each bar and having upwardly open sockets with cylindrical bottoms therein and disposed to hingingly support the trunnions in the sockets, the trunnion toms with the axes of the bar trunnions which they support, and the trunnion socket members being disposed outwardly, forwardly and rearwardly of the arms and constituting abutments reacted upon by the arms to prevent forward and rearward shifting of the mold carrying frame.`

2. In a molding apparatus of .the class described, a main frame, a mold carrying frame having a hinging connection at each of the opposite sides thereof with the main frame for alternate hinging movementl relative to the main frame, the said hinging connections comprising a pair of forwardly and rearwardly spaced arms at each side of the mold carrying frame, a pair of bars each projected through aligned perforations in one of the pairs of arms and detachably secured thereto, the bars being generally parallel to each other and the opposite end portions of each bar projecting forwardly and rearwardly beyond the arms and being .provided with axially aligned cylindrical bearing trunnions, a pair of upstanding brackets on the main frame corre-v.

sponding with each bar and provided with axially aligned cylindrical bores, a pair of trunnion socket devices corresponding to each b-ar and each comprising a head and a cylindrical shank, the heads of the socket devices having each an upwardly open socket with a cylindrical bottom aligned axiallywith the axis of the cylindricalv shank, kthe Shanks being detachably fitted in the bracket bores to dispose the pairs of cylindrical socket bottoms in axial alignment, the trunnions fitting the sockets and the socket bottoms providing axially aligned bearings for the trunnions, the heads being disposed forwardly and rear.- wardly outwardly of the arms and being reacted upon thereby to prevent forward and rearward shifting of the mold carrying frame.

3. In a molding apparatus of the class de.- scribed, a main frame,v a pair of mold carrying l frames having hinging connection with the main frame on a common axis, the hinging connectionv comprising a pair of brackets extending upwardly from the main frame and spaced apart forwardly and rearwardly, and having axially aligned cylindrical bores therein, trunnion socket members provided each with a head and a cylindrical shank, the Shanks being detachably fitted in the bores and the heads being disposed'in mutual confronting relation, a pair of bearing elements detachably mounted on one mold carrying frame and rotatablysupported on the socket members respectively coaxially with their Shanks, means to restrain said one mold' carrying frame and the bearing elements mounted thereon from shifting axially relative to the socket members, a pair of arms on the other mold carrying frame, a bar projected through axially aligned bores in the arms and detachably secured thereto, the

end portions of the bar projecting outwardly in opposite forward and rearward directions from the arms and constituting axially aligned cylinforwardly and rearwardly,

having each a socket therein, thebottom of Which is cylindrical and axially aligned with the shank and hingingly supporting a trunnion, the arms being disposed inwardly of the trunnion heads and reacting upon the same to prevent forward and rearward shifting of the said other mold carryingr frame.

4. In a molding apparatus of the `class de-v scribed, a main frame, a pair of U`shaped members having hinging connection with the main frame on a common axis, the hingingconnection comprising a pair, of bearing elements mounted projecting through the said arm perforations and detachably secured to the arms and projecting drical trunnions, the said'trunnion member heads `in axially aligned bores in the arms of one oppositely beyond the arms at the end portions of the bar and the end portions being cylindrical and constituting axially aligned cylindrical trunnions, the socket member heads being provided with upwardly open sockets having cylindrical bottoms `axially aligned respectively with the shanks, and the bottoms fitting and hingingly supporting the trunnions, and the arms of the second U-shaped member being disposed inwardy 1y of the trunnion heads and reacting upon the same to prevent forward and rearward shifting of the second U-shaped member, and a mold carrying frame detachably secured to each U- y:shaped member.

5. In a mold carrying apparatus of the class described, a main frame, a mold carrying frame having `hinglng connection with-the rearward side of the main frame, the hinging connection comprising a vpair of spaced apart brackets on the main frame each having therein a plurality of perforationsrthe perforations in one bracket being aligned with those in the other bracket in "pairs, at least one pair being spaced generally vertically from another and at least one pair being spaced from another 4in the forward and rearward direction, an arm on the'mold carrying frame disposed between the brackets and having a perforation therein, a bearing `pin arrangedto be detachably projected through a selected pair of aligned perforations in the brackets and through the. arm perforation, to hingingly connect the mold carrying frame to the main frame whereby they hinging' axis` of the mold carrying frame may be selectively adjusted vertically and by removing the pin from one pair of holes and placing it in another.

JAMES F. 1 MAINE. 

